QStyleHints Class

Property Documentation

[since 6.5] colorScheme : Qt::ColorScheme

This property holds the color scheme used by the application.

By default, this follows the system's default color scheme (also known as appearance), and changes when the system color scheme changes (e.g. during dusk or dawn). Setting the color scheme to an explicit value will override the system setting and ignore any changes to the system's color scheme. However, doing so is a hint to the system, and overriding the color scheme is not supported on all platforms.

Resetting this property, or setting it to Qt::ColorScheme::Unknown, will remove the override and make the application follow the system default again. The property value will change to the color scheme the system currently has.

When this property changes, Qt will read the system palette and update the default palette, but won't overwrite palette entries that have been explicitly set by the application. When the colorSchemeChange() signal gets emitted, the old palette is still in effect.

Application-specific colors should be selected to work well with the effective palette, taking the current color scheme into account. To update application- specific colors when the effective palette changes, handle PaletteChange or ApplicationPaletteChange events.

This property was introduced in Qt 6.5.

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See also Qt::ColorScheme, QGuiApplication::palette(), and QEvent::PaletteChange.

[since 6.8] contextMenuTrigger : Qt::ContextMenuTrigger

mouse event used to trigger a context menu event.

The default on UNIX systems is to show context menu on mouse button press event, while on Windows it is the mouse button release event. This property can be used to override the default platform behavior.

This property was introduced in Qt 6.8.

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See also Qt::ContextMenuTrigger.

[read-only] cursorFlashTime : const int

This property holds the text cursor's flash (blink) time in milliseconds.

The flash time is the time used to display, invert and restore the caret display. Usually the text cursor is displayed for half the cursor flash time, then hidden for the same amount of time.

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[read-only] fontSmoothingGamma : const qreal

This property holds the gamma value used in font smoothing.

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[read-only, since 6.5] keyboardAutoRepeatRateF : const qreal

This property holds the rate, in events per second, in which additional repeated key presses will automatically be generated if a key is being held down.

This property was introduced in Qt 6.5.

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[read-only] keyboardInputInterval : const int

This property holds the time limit, in milliseconds, that distinguishes a key press from two consecutive key presses.

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[read-only] mouseDoubleClickDistance : const int

This property holds the maximum distance, in pixels, that the mouse can be moved between two consecutive mouse clicks and still have it detected as a double-click

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[read-only] mouseDoubleClickInterval : const int

This property holds the time limit in milliseconds that distinguishes a double click from two consecutive mouse clicks.

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[read-only] mousePressAndHoldInterval : const int

This property holds the time limit in milliseconds that activates a press and hold.

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mouseQuickSelectionThreshold : const int

Quick selection mouse threshold in QLineEdit.

This property defines how much the mouse cursor should be moved along the y axis to trigger a quick selection during a normal QLineEdit text selection.

If the property value is less than or equal to 0, the quick selection feature is disabled.

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[read-only] passwordMaskCharacter : const QChar

This property holds the character used to mask the characters typed into text input fields in password mode.

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[read-only] passwordMaskDelay : const int

This property holds the time, in milliseconds, a typed letter is displayed unshrouded in a text input field in password mode.

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[read-only] setFocusOnTouchRelease : const bool

This property holds the event that should set input focus on focus objects.

This property is true if focus objects (line edits etc) should receive input focus after a touch/mouse release. This is normal behavior on touch platforms. On desktop platforms, the standard is to set focus already on touch/mouse press.

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[read-only] showIsFullScreen : const bool

This property holds whether the platform defaults to fullscreen windows.

This property is true if the platform defaults to windows being fullscreen, otherwise false.

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See also QWindow::show() and showIsMaximized().

[read-only] showIsMaximized : const bool

This property holds whether the platform defaults to maximized windows.

This property is true if the platform defaults to windows being maximized, otherwise false.

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See also QWindow::show() and showIsFullScreen().

showShortcutsInContextMenus : bool

true if the platform normally shows shortcut key sequences in context menus, otherwise false.

Since Qt 5.13, the setShowShortcutsInContextMenus() function can be used to override the platform default.

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See also Qt::AA_DontShowShortcutsInContextMenus.

[read-only] singleClickActivation : const bool

This property holds whether items are activated by single or double click.

This property is true if items should be activated by single click, false if they should be activated by double click instead.

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[read-only] startDragDistance : const int

This property holds the distance, in pixels, that the mouse must be moved with a button held down before a drag and drop operation will begin.

If you support drag and drop in your application, and want to start a drag and drop operation after the user has moved the cursor a certain distance with a button held down, you should use this property's value as the minimum distance required.

For example, if the mouse position of the click is stored in startPos and the current position (e.g. in the mouse move event) is currentPos, you can find out if a drag should be started with code like this:

if ((startPos - currentPos).manhattanLength() >=
        QApplication::startDragDistance())
    startTheDrag();

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See also startDragTime, QPoint::manhattanLength(), and Drag and Drop.

[read-only] startDragTime : const int

This property holds the time, in milliseconds, that a mouse button must be held down before a drag and drop operation will begin.

If you support drag and drop in your application, and want to start a drag and drop operation after the user has held down a mouse button for a certain amount of time, you should use this property's value as the delay.

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See also startDragDistance and Drag and Drop.

[read-only] startDragVelocity : const int

This property holds the limit for the velocity, in pixels per second, that the mouse may be moved, with a button held down, for a drag and drop operation to begin. A value of 0 means there is no such limit.

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See also startDragDistance and Drag and Drop.

[read-only] tabFocusBehavior : const Qt::TabFocusBehavior

This property holds the focus behavior on press of the tab key.

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[read-only] touchDoubleTapDistance : const int

This property holds the maximum distance, in pixels, that a finger can be moved between two consecutive taps and still have it detected as a double-tap

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useHoverEffects : bool

This property holds whether UI elements use hover effects.

This property is true if UI elements should use hover effects. This is the standard behavior on desktop platforms with a mouse pointer, whereas on touch platforms the overhead of hover event delivery can be avoided.

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[read-only] useRtlExtensions : const bool

This property holds the writing direction.

This property is true if right-to-left writing direction is enabled, otherwise false.

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[read-only] wheelScrollLines : const int

Number of lines to scroll by default for each wheel click.

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